This looks like bumblefoot, even though it is on top of the foot. In any case it looks infected. Whether a puncture wound or bumblefoot, this could be a nasty staph infection. We would suggest you contact your state veterinary board to see if there is an avian (bird) vet in your area. If that fails, you might call Columbus Zoo as they will have bird veterinarians on staff and may be able to help. The Regal Swan